Banksy, street art, graffiti, NYC: So I think I need an October trip to NYC!

“Hello, and welcome to Lower Manhattan,” the message begins, as elevator music plays. “Before you, you will see a ‘spray art’ by the artist Ban-sky. Or maybe not; it’s probably been painted over by now.”

This is the latest foray into street art by Banksy, the elusive British artist, and it is perhaps the most public and expansive of his works, taking over not just a patch of sidewalk or a shop wall but a whole city. Titled “Better Out Than In,” the exhibit was announced in his usual mysterious, pop-up fashion.

“For the next month Banksy will be attempting to host an entire show on the streets of New York,” read a message posted on the artist’s Web site on Tuesday, after clues that something was coming began appearing on posters in Los Angeles.